1. Postojna CavesPostojna Postojna Cave is a 24,340 m long karst cave system near Postojna, southwestern Slovenia. It is the second-longest cave system in the country as well as one of its top tourism sites. The caves were created by the Pivka River. From Wikipedia, the free encyclopedia.
3. Lake BohinjSlovenia Lake Bohinj , covering 318 hectares , is the largest permanent lake in Slovenia. It is located within the Bohinj Valley of the Julian Alps, in the northwestern Upper Carniola region, and part of Triglav National Park. From Wikipedia, the free encyclopedia.